Survival Time of in Broiler Crops.

spp. inhibit the growth of spp. . However, in chicken crops, in which spp. predominate, such inhibition of has not been confirmed. In our previous study, feeding paddy rice to broiler chicks increased the residence time of the food, which might enhance the bactericidal activity of the crop. Here, the bactericidal activity against the remaining spp. in broiler crops was evaluated. A suspension prepared by mixing and titanium dioxide (TiO) was inoculated into the pharynx of 26-day-old broiler chicks fed a paddy rice-based diet. The crop contents were sampled at 20-min intervals. The TiO residual ratio in the crop gradually decreased with time after inoculation, with 57% of the inoculated TiO remaining in the crop 60 min after inoculation. The survival fraction of in the crops was 11% at 40 min, only 1% at 60 min, and was undetectable at 80 min. Most of the inoculated died in the crop before entering the next segment. These data indicated that bacterial death occurred between 30 min and 40 min after inoculation. The average survival time of in the crop was calculated to be 37.1 min. Thus, remaining in a chicken crop for more than 40 min died.